Inspection Procedure 1: Power of the radio and CD player does not turn ON when the Ignition switch is in the "ACC" position or "ON" Position: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicle Communication Interface (V.C.I.)
  • MB991827 M.U.T.-III USB Cable
  • MB991910 M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code  .

   Check if the diagnostic trouble code is stored in the ETACS-ECU.

   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Connect scan tool MB991958. Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) .
   2. Turn the ignition switch to the "ON" position.
   3. Check whether the ETACS-ECU related DTC is stored.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the DTC stored? 

   • YES:  Troubleshoot the ETACS-ECU (Refer to DIAGNOSIS ), and then go to Step 2.
   • NO:  Go to Step 2.
     Fig 1: Connecting Scan Tool To Data Link Connector

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Using scan tool MB991958, check data list  .

   Check the input signal of ACC relay.

   • Turn the ignition switch to the ACC position.

     Item No.	Item name	Normal conditions
     Item 288	ACC switch	ON

     OK: Normal condition is displayed. 

   Q: Is the check result normal? 

   • YES:  Go to Step 3.
   • NO:  Refer to INSPECTION PROCEDURE 1 "THE IGNITION SWITCH (ACC) SIGNAL IS NOT RECEIVED" .
3. STEP 3. Check ETACS-ECU connector C-311 and radio and CD player connector C-104 for loose, corroded or damaged terminals, or terminals pushed back in the connector  .

   Q: Are ETACS-ECU connector C-311 and radio and CD player connector C-104 in good condition? 

   • YES:  Go to Step 4.
   • NO:  Repair or replace the damaged component(s) (Refer to HARNESS CONNECTOR INSPECTION ).
4. STEP 4. Check the power supply circuit to the radio and CD player. Measure the voltage at radio and CD player connector C-104  .
   1. Disconnect the connector, and measure at the wiring harness-side connector.
   2. Measure the voltage between terminal 30 and ground.

      OK: Battery positive voltage 

   Q: Is the measured voltage battery positive voltage? 

   • YES:  Go to  Step 6.
   • NO:  Go to Step 5.
     Fig 2: Measuring Voltage Between Terminal 30 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check the wiring harness between ETACS-ECU connector C-311 (terminal 7) and radio and CD player connector C-104 (terminal 30)  .
   • Check the power supply lines (battery power supply) for open circuit and short circuit.
     NOTE: Also check intermediate connector C-39, C-128 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-39, C-128 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between ETACS-ECU connector C-311 (terminal 7) and radio and CD player connector C-104 (terminal 30) in good condition? 

   • YES:  Go to Step 6.
   • NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
6. STEP 6. Check the power supply circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-307  .
   1. Disconnect the connector, and measure at the wiring harness-side connector.
   2. Measure the voltage between terminal 2 and ground.

      OK: Battery positive voltage 

   Q: Is the measured voltage battery positive voltage? 

   • YES:  Go to  Step 8.
   • NO:  Go to Step 7.
     Fig 3: Measuring Voltage Between Terminal 2 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Check the wiring harness between ETACS-ECU connector C-307 (terminal 2) and fusible link (36) 
   • Check the power supply line for open circuit and short circuit.

   Q: Is the wiring harness between ETACS-ECU connector C-307 (terminal 2) and fusible link (36) in good condition? 

   • YES:  Go to Step 8.
   • NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
8. STEP 8. Check that the radio and CD player is correctly grounded 

   The radio and CD player should be connected to the ground with an assembling screw.

   Q: Is the radio and CD player correctly grounded? 

   • YES:  Go to Step 9.
   • NO:  Securely install and ground the radio and CD player.
9. STEP 9. Retest the system 

   Check if the radio and CD player power is turned ON.

   Q: Is the check result normal? 

   • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   • NO:  Replace the radio and CD player.